?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
mm owner: fix race between swapoff and exit
[linux-2.6/next.git] / drivers / usb / c67x00 / c67x00-hcd.c
bloba22b887f4e9ef05d27c4425cbba18885f125f639
1 /*
2 * c67x00-hcd.c: Cypress C67X00 USB Host Controller Driver
3 *
4 * Copyright (C) 2006-2008 Barco N.V.
5 * Derived from the Cypress cy7c67200/300 ezusb linux driver and
6 * based on multiple host controller drivers inside the linux kernel.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
21 * MA 02110-1301 USA.
22 */
23
24 #include <linux/device.h>
25 #include <linux/platform_device.h>
26 #include <linux/usb.h>
27
28 #include "c67x00.h"
29 #include "c67x00-hcd.h"
30
31 /* --------------------------------------------------------------------------
32 * Root Hub Support
33 */
34
35 static __u8 c67x00_hub_des[] = {
36 0x09, /* __u8 bLength; */
37 0x29, /* __u8 bDescriptorType; Hub-descriptor */
38 0x02, /* __u8 bNbrPorts; */
39 0x00, /* __u16 wHubCharacteristics; */
40 0x00, /* (per-port OC, no power switching) */
41 0x32, /* __u8 bPwrOn2pwrGood; 2ms */
42 0x00, /* __u8 bHubContrCurrent; 0 mA */
43 0x00, /* __u8 DeviceRemovable; ** 7 Ports max ** */
44 0xff, /* __u8 PortPwrCtrlMask; ** 7 ports max ** */
45 };
46
47 static void c67x00_hub_reset_host_port(struct c67x00_sie *sie, int port)
48 {
49 struct c67x00_hcd *c67x00 = sie->private_data;
50 unsigned long flags;
51
52 c67x00_ll_husb_reset(sie, port);
53
54 spin_lock_irqsave(&c67x00->lock, flags);
55 c67x00_ll_husb_reset_port(sie, port);
56 spin_unlock_irqrestore(&c67x00->lock, flags);
57
58 c67x00_ll_set_husb_eot(sie->dev, DEFAULT_EOT);
59 }
60
61 static int c67x00_hub_status_data(struct usb_hcd *hcd, char *buf)
62 {
63 struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd);
64 struct c67x00_sie *sie = c67x00->sie;
65 u16 status;
66 int i;
67
68 *buf = 0;
69 status = c67x00_ll_usb_get_status(sie);
70 for (i = 0; i < C67X00_PORTS; i++)
71 if (status & PORT_CONNECT_CHANGE(i))
72 *buf |= (1 << i);
73
74 /* bit 0 denotes hub change, b1..n port change */
75 *buf <<= 1;
76
77 return !!*buf;
78 }
79
80 static int c67x00_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
81 u16 wIndex, char *buf, u16 wLength)
82 {
83 struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd);
84 struct c67x00_sie *sie = c67x00->sie;
85 u16 status, usb_status;
86 int len = 0;
87 unsigned int port = wIndex-1;
88 u16 wPortChange, wPortStatus;
89
90 switch (typeReq) {
91
92 case GetHubStatus:
93 *(__le32 *) buf = cpu_to_le32(0);
94 len = 4; /* hub power */
95 break;
96
97 case GetPortStatus:
98 if (wIndex > C67X00_PORTS)
99 return -EPIPE;
100
101 status = c67x00_ll_usb_get_status(sie);
102 usb_status = c67x00_ll_get_usb_ctl(sie);
103
104 wPortChange = 0;
105 if (status & PORT_CONNECT_CHANGE(port))
106 wPortChange |= USB_PORT_STAT_C_CONNECTION;
107
108 wPortStatus = USB_PORT_STAT_POWER;
109 if (!(status & PORT_SE0_STATUS(port)))
110 wPortStatus |= USB_PORT_STAT_CONNECTION;
111 if (usb_status & LOW_SPEED_PORT(port)) {
112 wPortStatus |= USB_PORT_STAT_LOW_SPEED;
113 c67x00->low_speed_ports |= (1 << port);
114 } else
115 c67x00->low_speed_ports &= ~(1 << port);
116
117 if (usb_status & SOF_EOP_EN(port))
118 wPortStatus |= USB_PORT_STAT_ENABLE;
119
120 *(__le16 *) buf = cpu_to_le16(wPortStatus);
121 *(__le16 *) (buf + 2) = cpu_to_le16(wPortChange);
122 len = 4;
123 break;
124
125 case SetHubFeature: /* We don't implement these */
126 case ClearHubFeature:
127 switch (wValue) {
128 case C_HUB_OVER_CURRENT:
129 case C_HUB_LOCAL_POWER:
130 len = 0;
131 break;
132
133 default:
134 return -EPIPE;
135 }
136 break;
137
138 case SetPortFeature:
139 if (wIndex > C67X00_PORTS)
140 return -EPIPE;
141
142 switch (wValue) {
143 case USB_PORT_FEAT_SUSPEND:
144 dev_dbg(c67x00_hcd_dev(c67x00),
145 "SetPortFeature %d (SUSPEND)\n", port);
146 len = 0;
147 break;
148
149 case USB_PORT_FEAT_RESET:
150 c67x00_hub_reset_host_port(sie, port);
151 len = 0;
152 break;
153
154 case USB_PORT_FEAT_POWER:
155 /* Power always enabled */
156 len = 0;
157 break;
158
159 default:
160 dev_dbg(c67x00_hcd_dev(c67x00),
161 "%s: SetPortFeature %d (0x%04x) Error!\n",
162 __func__, port, wValue);
163 return -EPIPE;
164 }
165 break;
166
167 case ClearPortFeature:
168 if (wIndex > C67X00_PORTS)
169 return -EPIPE;
170
171 switch (wValue) {
172 case USB_PORT_FEAT_ENABLE:
173 /* Reset the port so that the c67x00 also notices the
174 * disconnect */
175 c67x00_hub_reset_host_port(sie, port);
176 len = 0;
177 break;
178
179 case USB_PORT_FEAT_C_ENABLE:
180 dev_dbg(c67x00_hcd_dev(c67x00),
181 "ClearPortFeature (%d): C_ENABLE\n", port);
182 len = 0;
183 break;
184
185 case USB_PORT_FEAT_SUSPEND:
186 dev_dbg(c67x00_hcd_dev(c67x00),
187 "ClearPortFeature (%d): SUSPEND\n", port);
188 len = 0;
189 break;
190
191 case USB_PORT_FEAT_C_SUSPEND:
192 dev_dbg(c67x00_hcd_dev(c67x00),
193 "ClearPortFeature (%d): C_SUSPEND\n", port);
194 len = 0;
195 break;
196
197 case USB_PORT_FEAT_POWER:
198 dev_dbg(c67x00_hcd_dev(c67x00),
199 "ClearPortFeature (%d): POWER\n", port);
200 return -EPIPE;
201
202 case USB_PORT_FEAT_C_CONNECTION:
203 c67x00_ll_usb_clear_status(sie,
204 PORT_CONNECT_CHANGE(port));
205 len = 0;
206 break;
207
208 case USB_PORT_FEAT_C_OVER_CURRENT:
209 dev_dbg(c67x00_hcd_dev(c67x00),
210 "ClearPortFeature (%d): OVER_CURRENT\n", port);
211 len = 0;
212 break;
213
214 case USB_PORT_FEAT_C_RESET:
215 dev_dbg(c67x00_hcd_dev(c67x00),
216 "ClearPortFeature (%d): C_RESET\n", port);
217 len = 0;
218 break;
219
220 default:
221 dev_dbg(c67x00_hcd_dev(c67x00),
222 "%s: ClearPortFeature %d (0x%04x) Error!\n",
223 __func__, port, wValue);
224 return -EPIPE;
225 }
226 break;
227
228 case GetHubDescriptor:
229 len = min_t(unsigned int, sizeof(c67x00_hub_des), wLength);
230 memcpy(buf, c67x00_hub_des, len);
231 break;
232
233 default:
234 dev_dbg(c67x00_hcd_dev(c67x00), "%s: unknown\n", __func__);
235 return -EPIPE;
236 }
237
238 return 0;
239 }
240
241 /* ---------------------------------------------------------------------
242 * Main part of host controller driver
243 */
244
245 /**
246 * c67x00_hcd_irq
247 *
248 * This function is called from the interrupt handler in c67x00-drv.c
249 */
250 static void c67x00_hcd_irq(struct c67x00_sie *sie, u16 int_status, u16 msg)
251 {
252 struct c67x00_hcd *c67x00 = sie->private_data;
253 struct usb_hcd *hcd = c67x00_hcd_to_hcd(c67x00);
254
255 /* Handle sie message flags */
256 if (msg) {
257 if (msg & HUSB_TDListDone)
258 c67x00_sched_kick(c67x00);
259 else
260 dev_warn(c67x00_hcd_dev(c67x00),
261 "Unknown SIE msg flag(s): 0x%04x\n", msg);
262 }
263
264 if (unlikely(hcd->state == HC_STATE_HALT))
265 return;
266
267 if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
268 return;
269
270 /* Handle Start of frame events */
271 if (int_status & SOFEOP_FLG(sie->sie_num)) {
272 c67x00_ll_usb_clear_status(sie, SOF_EOP_IRQ_FLG);
273 c67x00_sched_kick(c67x00);
274 set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
275 }
276 }
277
278 /**
279 * c67x00_hcd_start: Host controller start hook
280 */
281 static int c67x00_hcd_start(struct usb_hcd *hcd)
282 {
283 hcd->uses_new_polling = 1;
284 hcd->state = HC_STATE_RUNNING;
285 hcd->poll_rh = 1;
286
287 return 0;
288 }
289
290 /**
291 * c67x00_hcd_stop: Host controller stop hook
292 */
293 static void c67x00_hcd_stop(struct usb_hcd *hcd)
294 {
295 /* Nothing to do */
296 }
297
298 static int c67x00_hcd_get_frame(struct usb_hcd *hcd)
299 {
300 struct c67x00_hcd *c67x00 = hcd_to_c67x00_hcd(hcd);
301 u16 temp_val;
302
303 dev_dbg(c67x00_hcd_dev(c67x00), "%s\n", __func__);
304 temp_val = c67x00_ll_husb_get_frame(c67x00->sie);
305 temp_val &= HOST_FRAME_MASK;
306 return temp_val ? (temp_val - 1) : HOST_FRAME_MASK;
307 }
308
309 static struct hc_driver c67x00_hc_driver = {
310 .description = "c67x00-hcd",
311 .product_desc = "Cypress C67X00 Host Controller",
312 .hcd_priv_size = sizeof(struct c67x00_hcd),
313 .flags = HCD_USB11 | HCD_MEMORY,
314
315 /*
316 * basic lifecycle operations
317 */
318 .start = c67x00_hcd_start,
319 .stop = c67x00_hcd_stop,
320
321 /*
322 * managing i/o requests and associated device resources
323 */
324 .urb_enqueue = c67x00_urb_enqueue,
325 .urb_dequeue = c67x00_urb_dequeue,
326 .endpoint_disable = c67x00_endpoint_disable,
327
328 /*
329 * scheduling support
330 */
331 .get_frame_number = c67x00_hcd_get_frame,
332
333 /*
334 * root hub support
335 */
336 .hub_status_data = c67x00_hub_status_data,
337 .hub_control = c67x00_hub_control,
338 };
339
340 /* ---------------------------------------------------------------------
341 * Setup/Teardown routines
342 */
343
344 int c67x00_hcd_probe(struct c67x00_sie *sie)
345 {
346 struct c67x00_hcd *c67x00;
347 struct usb_hcd *hcd;
348 unsigned long flags;
349 int retval;
350
351 if (usb_disabled())
352 return -ENODEV;
353
354 hcd = usb_create_hcd(&c67x00_hc_driver, sie_dev(sie), "c67x00_sie");
355 if (!hcd) {
356 retval = -ENOMEM;
357 goto err0;
358 }
359 c67x00 = hcd_to_c67x00_hcd(hcd);
360
361 spin_lock_init(&c67x00->lock);
362 c67x00->sie = sie;
363
364 INIT_LIST_HEAD(&c67x00->list[PIPE_ISOCHRONOUS]);
365 INIT_LIST_HEAD(&c67x00->list[PIPE_INTERRUPT]);
366 INIT_LIST_HEAD(&c67x00->list[PIPE_CONTROL]);
367 INIT_LIST_HEAD(&c67x00->list[PIPE_BULK]);
368 c67x00->urb_count = 0;
369 INIT_LIST_HEAD(&c67x00->td_list);
370 c67x00->td_base_addr = CY_HCD_BUF_ADDR + SIE_TD_OFFSET(sie->sie_num);
371 c67x00->buf_base_addr = CY_HCD_BUF_ADDR + SIE_BUF_OFFSET(sie->sie_num);
372 c67x00->max_frame_bw = MAX_FRAME_BW_STD;
373
374 c67x00_ll_husb_init_host_port(sie);
375
376 init_completion(&c67x00->endpoint_disable);
377 retval = c67x00_sched_start_scheduler(c67x00);
378 if (retval)
379 goto err1;
380
381 retval = usb_add_hcd(hcd, 0, 0);
382 if (retval) {
383 dev_dbg(sie_dev(sie), "%s: usb_add_hcd returned %d\n",
384 __func__, retval);
385 goto err2;
386 }
387
388 spin_lock_irqsave(&sie->lock, flags);
389 sie->private_data = c67x00;
390 sie->irq = c67x00_hcd_irq;
391 spin_unlock_irqrestore(&sie->lock, flags);
392
393 return retval;
394
395 err2:
396 c67x00_sched_stop_scheduler(c67x00);
397 err1:
398 usb_put_hcd(hcd);
399 err0:
400 return retval;
401 }
402
403 /* may be called with controller, bus, and devices active */
404 void c67x00_hcd_remove(struct c67x00_sie *sie)
405 {
406 struct c67x00_hcd *c67x00 = sie->private_data;
407 struct usb_hcd *hcd = c67x00_hcd_to_hcd(c67x00);
408
409 c67x00_sched_stop_scheduler(c67x00);
410 usb_remove_hcd(hcd);
411 usb_put_hcd(hcd);
412 }
linux-next